Mavros/local_position/pose in SITL mode returns the root link's pose?

Hello friends,
– Met one problem, if customize a quadrotor model but the quadrotor is not in this new model’s root link, i.e., the base_link of this quadrotor is not root link but Link_1 for example is the root link, in the gazebo simulation, if print the /mavros/local_position/pose it actually print the Link_1, i.e., root link’s pose not the quadrotor’s !!

– anyone know how to let the mavros know where is the quadrotor and feedback the correct info, I also doubt other mavros plugins have this issue too. like gpu, imu, etc. it may only take the root link’s data from gazebo.